Joe Otterson TV Reporter The “NCIS” prequel series in the works at CBS has cast Austin Stowell in the read role of a young Leroy Jethro Gibbs, Variety has learned. The series, titled “NCIS: Origins,” was originally ordered at CBS in January with plans to launch during the 2024-2025 broadcast season. Mark Harmon, who played Gibbs for nearly two decades in the mothership series, will serve as the show’s narrator and executive producer.